SF->FF
y = x2 + 19x + 90
y = (x+9)(x+10)
y = (x+5)(x-8)
y = x2 - 3x - 40
y = (x+4)2
y = x2 +8x +16
y = x2 - 6x + 9
y = (x-3)2
y = x2 + x - 42
y = (x+7)(x-6)
y = (x+1)(x+14)
y= x2 + 15x + 14
y = (x-10)2
y = x2 - 20x + 100
y = x2 - 2x + 5
y = (x-1)2 + 4
y = 10x2 - 20x + 10
y = 10(x-1)(x-1)
y = (x+9)(x-9)
y = x2 - 81
y = 2(x - 5)2 + 20
y = 2x2 - 20x + 70
y = x2 + 10x - 25
y = (x+5)2 - 50
y = x2 - 25
y = (x+5)(x-5)
y = (2x + 3)(5x - 3)
y = 10x2 - 9x - 9
y = -3(x + 3)2
y = -3x2 - 18x - 27
y = 3x2 + 18x + 30
y = 3(x+3)2 + 3
y = 28x2 - 71x + 18
y = (7x-2)(4x-9)
y = 3(x+4)(x-7)
y = 3x2 - 9x - 84
y = (x + 10)2 - 0.5
y = x2 + 20x + 99.5
y = x2 + 4x
y = (x+2)2 - 4